I'm sorry for all the bad stuff that happened but after 3 years it's not a manufacturer issue, it's purely a maintenance thing.
The bearingz should have been repacked when the trailer was one years old (though I checked mine when they were new..) and any failure after that is the fault of who ever did the work or who ever let too much time go by before checking them again.
I don't repack mine every year but I do check them for roughness and adjustment. I also check them for heat every time I stop.
The next item you need to watch is the axle shackles. They can wear out and fail in a catastrophic manner as well.
For some reason, it always seems to come back to the OP's fault. Car bearings can go ten years without any attention, the OP purchases an RV and the bearings have to be repacked every year. Cars purchased new and driven every day come with at least a three year warranty if not more. An RV that is purely a recreational occasional use vehicle has a one year warranty and requires annual maintenance. Maybe the manufacturers should start making RV's better with longer maintenance intervals. Car manufacturers do. I am with the OP on this one and would not be very happy. Hopefully the OP learned the
extended warranty lesson and won't make that mistake again. The OP can purchase a lot of grease and bearing seals for $1700.
I carry in the TT a bearing kit (bearings and races), seals, drift, hammer, wrench, brake adj tool or screwdriver, jack and grease. Everything (except the jack) is less than $50 and can fix a bad bearing in a rest area, campground, even alongside the road if necessary. The OP should also. And if the OP wants to be really careful, purchase an infrared temp probe gauge and check temps every stop. That is a really good early warning of a potential problem. Sometimes it is
really about us knowing how to fix brakes and bearings to avoid the costly and time consuming issues the OP is going thru to get some relief. For less than $50 the OP could have avoided all his aggravation and got home before dealing with Dexter on axle replacement.